# Questions Asked onSeptember 29, 2013

1. ## delftx

We are going to build a PV system on a roof of 10m2, and we have two possible PV modules: (1) A first generation module with efficiency η=17% and cost of 0.80€/Wp. (2) A second generation PV module with efficiency η=10% and cost of 0.40€/Wp. The

A bottle of 12.0 M hydrochloric acid has only 35.7 mL left in it. What will the HCl concentration be if the solution is diluted to 250.0 mL?

3. ## Probability and Statistics

An oil prospector will drill a succession of holes in a given area to find a productive well. The probability that he is successful on a given trial is 0.2. a) What's the probability that that the third hole drilled is the first to yield a productive well?

4. ## chem

How many moles of carbon are needed to react with 525 g of hematite 2FeO3+6C->4Fe+3Co2 idk how to convert moles of fe2o3 to carbon

5. ## AP Chemistry

Consider the reaction 2 Al2O3(s) ! 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ? 1. -424 kJ 2. -2735 kJ 3. -1695 kJ 4. -1368 kJ 5. -26,521 kJ 6. -21,962 kJ 7. -685 kJ 8.

6. ## chem

The reaction: 2C2H2+5O2->5O2->4CO2+2H2O is performed by mixing 175 grams of C2H2 and 175 grams of O2 to produce 127 grams of CO2 1)Limiting reagent 2)Theretical yeield of CO2 3)Percent yield of CO2

7. ## Probability and Statistics (Continuation)

Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth

8. ## offfice finaces

Using your computer software, you create a new file for an existing customer. When you're finished, you should A. coordinate the old and new files by giving both the same name. B. overwrite the existing file by giving the new file the same name. C. allow

9. ## Statistics

1. A human gene carries a certain disease from a mother to her child with a probability rate of 0.58. That is, there is a 58% chance that the child becomes infected with the disease. Suppose a female carrier of the gene has five children. Assume that the

10. ## Geometry

A regular pentagonal solid prism has 9cm base edges. A larger, similar solid prism of the same material has 36cm base edges. How does each indicated measurement for the larger prism compare to the same measurement for the smaller prism? Find the volume and

11. ## Physics

Problem 3- If a bug can jump straight up to a height of 0.5 m. a) what is its initial speed as it leaves the ground? b) How long is it in the air?

12. ## physics

A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves

13. ## chem

write the correct net ionic equation and identify spectator ions when CoSO4 and BaCL2 mix

At the beach, 3 children pull on a floating toy. Child 1 plus with a force of 15N [N 24°E], child 2 pulls south and child 3 pulls west. The net force of the toy is zero. Assume that there are no other significant forces acting on the toy. a) Calculate the

15. ## Science/Math

Word Problems pages 18-19 A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that

16. ## Math

Ms. Santiago has many pens in her desk drawer. She says that if you divide the total number of pens by 1, 2, 3, 4, 5, or 6, you get a remainder of 1. What is the least number of pens that could be in ms. Santiago's drawer,

17. ## Chemistry

What is the compound formula for Cation: Na+ and Anion: CN-

18. ## maths

Find the mean, variance and standard deviation for the following data 6, 12, 6, 8, 10, 8, 12, 8, 14, 16

19. ## PHYSICS

A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C

20. ## Chemistry

How long would it take for 2.2 x 10^-4 mol H2 to effuse through the same orifice as the 2.2x 10^-4 mol N2? (It takes 105s for N2 to effuse) I was thinking of setting up the equation like: sqroot(28.014gN2/mol / 2.016g H2/mol) = 3.728 What should I do next?

21. ## help!!!!!!!! Physics

A microbiologist measures the speed of a swimming bacterium. The bacterium covers a distance of 2.16 microns in 5.0 seconds. The biologist wished to compare the speed of the bacteria with other animals, but the speeds of other animals are listed in

22. ## Earth Science

A contour (topographic) map indicates that a stream is flowing across a landscape. If the stream has a constant volume, where on the map would the stream most likely have the highest velocity? a. As the stream moves across several closely spaced contour

23. ## science

which component of the technological system is achieved when your camera takes a photograph ? a) input b) feedback c) goal d) constraint

24. ## physics

Given the forces Fa= 2.3 N [S 35° W], Fb= 3.6N [N 14° W] and Fc= 4.2N [S 24°E] calculate the following: Fa + Fb + Fc

25. ## social studies

daydreaming can be an expression of: A) repression B) denial C) sublimation D) projection My answer is D

26. ## physics

A large boulder is ejected vertically upward from a volcano with an initial speed of 39.0m/s . Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at a speed 19.0m/s upward? (b) At what time is it moving at a speed

27. ## English

really need help on this question it is worth 5 marks. The question is: Explain how "A Thankless Experience" is a satire with support with direct reference to the essay. The short essay is called A Thankless Experience by Stephen Lautens' it is on the

28. ## Math

How would you solve these compound inequalities? 1. -5k-9 2. 1/2z+3=1/5 3. -2

29. ## math

3. For the following, state the domain, range, and state whether the relation is a function. If it is not a function explain why. {(3,2), (4,5), (8,5), (-3,2)} {(4,5), (2,3), (-2,4), (9,3)} {3,2), (5,10), (20, 4), (3, 8)} .

30. ## Physics

A cyclist maintains a constant velocity of 5.2 m/s headed away from point A. At some initial time, the cyclist is 251 m from point A. What will be his displacement from his starting position after 85 s? Answer in units of m What will be his position from

31. ## Geometry

Which is the best approximation of the volume of the ball of string? A. 300ft^3 B. 600ft^3 C. 1,200ft^3 D. 2,400ft^3

32. ## Geometry

Two similar pyramids have laterl area 8ft^2 and 18ft^2. The volume of the smaller pyramid is 32ft^3. Find the volume of the larger pyramid.

33. ## uncertainty principle

an electron inside spherical metallic particle of volume 10^ -12 metre cube has a kinetic energy about 10 eV. use uncertainty relations to find relative uncertainty in electron velocity .

34. ## Math Probabilities

A standard deck of cards contains 52 cards. Of these cards there are 13 of each type of suit (hearts, spades, clubs, diamonds) and 4 of each type of rank (A – K). Two cards are pulled in order from this deck of 52 playing cards. What is the probability

35. ## Math

A standard deck of cards contains 52 cards. Of these cards there are 13 of each type of suit (hearts, spades, clubs, diamonds) and 4 of each type of rank (A – K). Three cards are pulled in order from this deck of 52 playing cards. What is the probability

36. ## chemistry again

how do you find the concentration of an ion remaining after a reaction is complete???

37. ## chemistry

What volume of 0.140 M HCl is needed to neutralize 2.53g of Mg(OH)_2

38. ## Chem Simple question

Magnesium metal burns in oxygen to form magnesium oxide, MgO. (a) Write a balanced equation for the reaction Why is it 2Mg+O2->2MgO and not Mg+O->MgO

39. ## math help

5x+10y +15z-15x+10y-5z+5x-10y-5z / (5x+10y+15z)-(15x+10y-5z)+(5x-10y-5z) a. 1/3 b. 1 c. x+2y+z / x-2y+3z d. x-2y-z / x+2y-3z e. x-2y-z / x+2y+z my answer is none of above, is - 1/3, I didn't know I done it wrong or the question is not correct

40. ## AP Chemistry

Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO(g) + O2(g) --> 2CO2(g) change in H for this reaction is −135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted? 1. 16.3 mol 2. 40.5 mol 3.

41. ## math

1,1/3,1/5,1/7, meaning the next number is 1/9 right?

42. ## Math

How would you use a number line to round 148 to the nearest ten.Explain.

43. ## Chemistry

A 50mL solution of NaOH is neutralized by adding 37.5 mL of 0.045 M HCL. What was the original concentration of the NaOH solution?

44. ## Chemistry

A .500g unknown sample is titrated with 40mL of .187M KMno4 by the following reaction: 5Fe{2+} + MnO4{-1} + 8H{+1} -> 5Fe{3+} + Mn{2+} + 4H2O. What is the percentage of iron in the following sample

Simplify Exponents ba*(2ba4)-3

46. ## Live Tutors

Is there a website that has live tutors for free? Not like tutor. com when you have to sign up with a credit card for a trial.

47. ## orchestra

I will take up a free WordPress site around the WordPress blogs web site (not rellay my own site) but I don't just like the designs they feature. Am i able to start using a acquired design on there? I know of a few Hubpages put websites with different

48. ## science

you calculate the area of a 150 m x 100.0 m room. How many significance figures should your answer include ? a) 1 b) 2 c) 3 d) 4

49. ## French

I need to replace the verbs with on. i need help please. ex: Les gens admirent es belles couleurs du Paradisier. ex: On admire les belles couleurs du paradisier. 1)C'est vrai que les gens ont tres peur des araignees, surtout de la veuve noire. 2)D'ou vient

50. ## science

you calculate the area of a 150 m x 100.0 m room. How many significance figures should your answer include ? a) 1 b) 2 c) 3 d) 4

51. ## chem

how many mL of .135M Sr(OH)2 are needed to neutralize 35ml of .157M HCL I know the answer came out to 20.4 ml My only question is how do I convert HCL to Sr(OH)2

52. ## Chemistry

How many potassium atoms in 7.50g of potassium chromate?

53. ## Chemistry

Calculate the number of phosphorus atoms in 17.0g sample of calcium phosphate

54. ## physics

(time given is the total time in the air, up and down) During a baseball game, a batter hits a high pop-up. If the ball remains in the air for 4.84 s, how high does it rise? The acceleration of gravity is 9.8 m/s2 . Answer in units of m

55. ## social studies

people in countries with tend to be happier A) high incomes B) low incomes C) more civil liberties D) high incomes and more civil liberties My answer is B.

56. ## math

what is the expression for the factored form of 1/4y^2-36? I got (1/4y-6)(1/4y+6) Is this correct? Thanks for checking my work

57. ## ecology

how do you construct a age pyramid. i have the age class and observed individuals how do i get the present in each age class

58. ## Chem

A 4.96L sample of chlorine gas is contained in a poison control vessel at STP. Calculate the number of grams in this sample

59. ## Chem

Calculate the massif 3.76x10^20 molecules of tricarbon disulphide. Determine the volume,at STP, of 10.24mol helium gas.

60. ## Chemistry

Some bacteria get their energy from reduction of CO2 to CH4 by H2. 1. How many electrons are required to reduce CO2 to CH4? 2. Calculate the G for formation of methane based on the two standard reduction potential of -0.171V for reduction of CO2 to CH4 and

61. ## math subtracting mixed numbers

9 and 3/4 minus 4 and 1/3 =

62. ## Chemistry

Diarsenic trioxide is the number one source of arsenic; determine the mass of a sample of this extremely poisonous material containing 4.03x10^18 molecules.

63. ## math

what is the expression for factorization of 6x^2+24? I got 6(x+2)(x-2) Hopefully I got this correct. Thanks for checking for me, I appreciate it.

64. ## Math

Ms. Santiago has many pens in her desk drawer. She says that if you divide the total number of pens by 1, 2, 3, 4, 5, or 6, you get a remainder of 1. What is the least number of pens that could be in ms. Santiago's drawer,

65. ## math

how do you solve this problem (m-5)^4+36=13(m-5)^2 algebraically

67. ## Stats/ Probability

Repeated die toss experiment. A fair die is tossed repeatedly, and the sequence of numbers that turn up is recorded, until a 1 is obtained. When a 1 is obtained, the experiment is over, but the 1 is included in the sequence. Thus every outcome is a

68. ## Math

How do you Draw and label 2 different rectangles each with a perimeter of 124 units

69. ## Chemistry

The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.

70. ## US history

What were conditions like for the workers befor the beginging of the labor movment?

71. ## Math

How would you find the domain and range of x=2^y?

73. ## chemistry

How many mL of 0.416 M of HCl are needed to dissolve 8.68 g of BaCO3? 2HCl(aq)+BaCO3(s)=BaCl2(aq)+H2O(l)+CO2(g)

74. ## Chemistry

K2SO4+ Na2HPO4=? NaHCO3 + Sr(NO3)2=?

75. ## Math

How would you solve these compound inequalities? 1. -1

76. ## maths

An initial-value problem is given by the differential equation, f(x,y) = x + y, y(0) = 1.64 The Euler-midpoint method is used to find an approximate value to y(0.1) with a step size of h = 0.1. Then use the integrating factor method, to find the exact

77. ## English Question

What is the difference between though and although?

78. ## math

1. Thomas wants to lose weight for the summer. He currently weighs 245 pounds. He wants to lose 5 pounds a month. What is the linear equation that describes is weight loss? If it is September, how much weight will Thomas lose by July (July not included)?

79. ## mitx

Consider a flat plate in a supersonic flow at an angle of attack as shown in the figure above, and assume the flow is inviscid. We will learn later in the course that the resulting flow is such that the pressure is uniform on both the upper surface and

2x^2+2x>4

81. ## Physics 2

A 3.0-g string, 0.14 m long, is under tension. The string produces a 200-Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. Find the tension in the string.

82. ## Science

I need help with finding a picture that goes with Newton's first, second,and third law of motion

83. ## Math

How would you solve these compound inequalities word problems? 1. The human ear can distinguish sounds between 20Hz and 20,000 Hz, inclusive. 2. For a man to box as a welterweight, he must weigh more than 140 lbs, but at most 147 lbs.

84. ## life science , geography , history and math literecy

I am a grade 11 student and want to follow careers linked to geograpy . My problem is that most of the careers I am in interested in want pure math and im doing math literecy . My question is that , Is it possible for me to start mathematics in University

85. ## Pre Calculus

He needs two adjacent rectangular enclosures - he has 300 feet of fencing. a. find a function that models the total area of enclosures with respect to the width of the enclosures. b. write your function in vertex form using the vertex formula. c. what is

86. ## MATH

customers loan of 675 the annual interest is 19.25. what is the total dollar amount to be repaid including principle and interest for the entire year?

87. ## Science

Can someone please send me a picture explination of Newton's third law and about a paragraph explaining how it works and stuff thank you .

88. ## Chemistry

The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.

89. ## college physics

An object acted on by three forces moves with constant velocity. One force acting on the object is in the positive x direction and has a magnitude of 6.4N ; a second force has a magnitude of 5.0N and points in the negative y direction.

90. ## Math

Solve the system by substitution or elimination. x^2 + 2y^2 = 8 x^2 - y^2 = 1

91. ## math

amount of matter in an object

92. ## Physics

A 2.86 kg block starts from rest at the top of a 27.5◦ incline and slides 1.94 m down the incline in 1.43 s. The acceleration of gravity is 9.8 m/s2. What is the speed of the block after it slid the1.94 m? Answer in units of m/s

93. ## physics

a body is under of 2 forces 7n and 10n find the resultant of 2 forces if (a)the forces are parallel and act in thesame direction (b)the forces are parallel and act in opposite direction(c)the two forces are inclined and act at an angle of 60 degree to each

94. ## physics

a body is under of 2 forces 7n and 10n find the resultant of 2 forces if (a)the forces are parallel and act in thesame direction (b)the forces are parallel and act in opposite direction(c)the two forces are inclined and act at an angle of 60 degree to each

117. ## statistics,math

Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection. Be very specific in your presentation

118. ## Chemitry

if your smoke detector contains 0.10 mg of 241Am, how long will it take to decay 1.25 * 10^-2mg

119. ## Geometry

find the radius of a sphere withh the given property. A.The number of square meters of a surface area equals the number of cubic meters of volume. B. The ratio of surface area in square meters to volume in cubic meters is 1:5.

120. ## Physical Conceptual Science

Trucks often have signs on the back that say, “If you can’t see my mirrors, I can’t see you.” Explain the physics.

121. ## Chemistry

Saccharin (C7H5NO3S) is sometimes dispensed in tablet form. Ten tablets with total mass of 0.5860 g were dissolved in water. They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride

122. ## Geometry

what is the radius of the ball of string to the nearest tenth of a foot? A. 3.3 B. 6.6 C. 13.2 D. 20.75

123. ## SS

The political movement that brought Africans together in the 1950s was known as ________. a. imperialism b. salt trade c. colonialism d. Pan-Africanism Enslaved Africans from West Africa traveled across the Atlantic Ocean to European Colonies in the

124. ## physics

A tennis player kits a ball at ground level giving it initial velocity of 22.0 m/s at 58 degrees above the horizontal. Any help would be appreciated. Thanks.

125. ## Algebra 1

You had $22 to spend on four raffle tickets. After buying them you had$6. How much did each raffle ticket cost?

126. ## Algebra

Consider two points A=(2,5) and B=(4,3), and a third point P=(a,b) on the x-axis. If the minimum value of line PA^2+ line PB^2 is c, what is a+b+c?

127. ## Geometry

The slan heights of two similar pyramids are in the ratio 1:5. The volume of the smaller pyramid is 60m^3. What is the volume in cubic meters of the larger pyramid?

128. ## Geometry

A lawn chair weighs 8Ib. A child's lawn chair has dimensions exactly one half those of the larger chair. How many pounds does the child's chair weigh?

129. ## maths

Ramesh buys 150 shares of par value  10/- each of a company which pays annual dividend of 15% at such a price that he receives 10% on his investments. What is the market value of share?

130. ## maths

At what rate of interest per annum, the amount  10, 000/- will be doubled in 5 years, interest being compounded quarterly?

131. ## Geometry

The volume of two similar rectangular prisms are 64cm^3 and 1000cm^3. The surface area of the smaller figure is 112cm^2. What is the surface area in square centimeters of the larger figure?

132. ## science

What is then volume in mL of then solution 3.04g of sodium chloride from a 0.110 M solution?

133. ## maths

In a family of two children, find the probability that the family has two boys given that the first child is a boy.

134. ## chemistry

What mass of KCl \rm KCl is needed to precipitate the silver ions from 13.0mL mL of 0.200 M M AgNO 3 \rm AgNO_3 solution

135. ## Geometry

Find the missing length. MG=10cm, NP=4cm, QP= 14cm, MN=____cm

136. ## maths

How much does it cost to paint a triangular surface of sides 6 m, 5 m and 11 m at the rate of ` 20/- per 2 m ?

137. ## Chemistry

Saccharin (C7H5NO3S) is sometimes dispensed in tablet form. Ten tablets with total mass of 0.5800 g were dissolved in water. They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride

138. ## maths

Two cones with same base radius 4 cm and height 8 cm are joined together along their bases. Find the surface area of the shape so formed.

139. ## physics

Q1) consider a stationary nucleus of mass M. show that the minimum energy the photon must have to create an electron-positron pair in the presence of stationary nucleus is 2mc^2(1+ m/M) where m is the rest mass of the electron.

140. ## physics

(time given is the total time in the air, up and down) During a baseball game, a batter hits a high pop-up. If the ball remains in the air for 4.84 s, how high does it rise? The acceleration of gravity is 9.8 m/s2 . Answer in units of m

How does altitude affect the freezing, melting and boiling points of water?

142. ## Probability and Statistics

Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth

143. ## Chemistry

Calculate the molarity of a solution prepared by dissolving 16 g of urea, NH2CONH2, in 39 g of H2O. The density of the solution is 1.3 g/mL. I've tried this question so many times but I keep getting it wrong please help me

144. ## Probability Math

Event A has probability of 0.2 and event B has probability of 0.3. If they are independent, what is the probability that both of them happen? I can't remember how to do this one.

145. ## chemistry

44.0 mL \rm mL of 0.150 M M Na 2 SO 4 \rm Na_2SO_4 and 25.0 mL \rm mL of 0.160 M M KCl M Na + M_{\rm Na^+}, M SO 4 2− M_{\rm {SO_4}^{2-}}, M K + M_{\rm K^+}, M Cl − =????

146. ## Math

There are 45 candies in a bowl, 20 red and 25 yellow. If two are taken from the bowl, what is the probability they will be two red candies? here is what I have but I need help with the rest or even knowing if I am right. 20/45 25/43 25 * 20 = 500 45 * 43 =

147. ## more chemistry

What volume of 0.115 M M HClO 4 \rm HClO_4 solution is needed to neutralize 58.00mL mL of 8.75×10−2 M M NaOH \rm NaOH

153. ## Maths

An initial-value problem is given by the differential equation, f(x,y) = –20xy2, y(1) = 1. Use the classical fourth-order Runge-Kutta method with a step-size of h = 0.02, to obtain the approximate value of y(1.02). Give your answer to 6 decimal places.

154. ## Combinatorics

Calvin has 3 red juggling pins, 4 blue juggling pins, 5 white juggling pins, and 6 green juggling pins. How many ways can he give a set of 3 juggling pins to Dan?

155. ## chemistry

Concentrated sulfuric acid (18.3 M) has a density of 1.84 g/mL. How many moles of H2SO4 are in each milliliter of solution?

156. ## Calculus

A function of three variables is given by, f (x,y,t) = x3y2sin t + 4x2t + 5yt2 + 4xycos t Find ft (3.44,0.58,8.1) giving your answer to 3 decimal places. anybody please help me... thanks a million... got stuck with this qns..

157. ## Chemistry

Some bacteria get their energy from reduction of CO2 to CH4 by H2. 1. How many electrons are required to reduce CO2 to CH4? 2. Calculate the G for formation of methane based on the two standard reduction potential of -0.171V for reduction of CO2 to CH4 and

158. ## algebra

trying to solve a point a slope word problem. you are scheduled to start your job at an oil change shop 2 hours after shop opens. two hours after you start, a total of 11 cars have had their oil changed. three hours later, a total of 14 cars have had their

159. ## Physics

what is the relationship between forces in equilibrium and their components?

160. ## Physics

Problem 2- A car is stopped at a traffic light. It then travels along a straight road so that its position from the light is given by x(t) 2.5t - 0.13t^2 in meters. c. What is the position of the particle when it reverses its motion?

161. ## Chemistry

CuSO4+LiNo3 Potassium sulfate+lithium nitrate Can someone help me figure out the equations for these two? Phases aren't required

162. ## Physics

Problem 4- Speedy car, driving at 30 m/s. The driver suddenly observes a slow-moving van 155 m ahead traveling at 5 m/s in the same direction. The driver of the car immediately applies the brakes causing a constant acceleration of 2 m/s2 in a direction

163. ## math help

(2np.3r/4r)-(2np-3n)=? a. -1/2np+3n b. -1/2np-3n c. -np/2r+3n d. 1/2np+3n e. 1/2np-3n Please answer and explan

164. ## psy 331

Wilhelm Wundt is known for his research relating to introspection. During the use of this technique, participants receive: (Points : 1) subliminal messages from the researcher and are asked if they remember the messages. a stimulus from the researcher and

165. ## Math

state and prove the distributive property of rational numbers.

166. ## philosophy logic - math

Natural Deduction Proof 1. 1 ~Y ⇒ ~L 2 W v ~Y 3 W ⇒ ~B / ~B v ~L 2. 1 ~U • (G = ~T) 2 (~U v D) ⇒ (W • ~R) / W • ~U 3. 1 (M ⇒ P) ⇒ ~P 2 H ⇒ P 3 M ⇒ H / ~H 4. 1 ~Z 2 S 3 Zv(S ⇒ H) / H

167. ## Social Studies

Which of the following describes the economies of Ghana and the Democratic Republic of the Congo (DRC)? a. Ghana has a stable, fast-growing economy while DRC has an unstable economy due to internal conflict. b. The economies of both Ghana and DRC are

168. ## Math

Prove that (xt+yr)/yt is already in lowest terms, b and d have no common prime factor. Note that x/y and r/t are fractions in reduced terms.

169. ## Math

Finding the critical value(s) of x^2, and use a x^2 distribution table to find the limits containing the P-value. Determine whether there is sufficient evidence to support the given alternative hypothesis. Test Ho:theta=2.63,Versus H1:theta does not

170. ## music

what is a piece of music that i can research it in depth?

171. ## physics

an electron inside spherical metallic particle of volume 10^ -12 metre cube has a kinetic energy about 10 eV. use uncertainty relations to find relative uncertainty in electron velocity

172. ## physics

consider a stationary nucleus of mass M. show that the minimum energy the photon must have to create an electron-positron pair in the presence of stationary nucleus is 2mc^2(1+ m/M) where m is the rest mass of the electron.

173. ## ap chem

What volume of 0.140 M HCl is needed to neutralize 2.53g of Mg(OH)

174. ## ap chem

If 26.0mL of AgNO 3 is needed to precipitate all the Cl −ions in a 0.750-mg sample of KCl (forming AgCl), what is the molarity of the AgNO 3 solution

175. ## PHYSICS

Two protons in a molecule are 3.80 multiplied by 10-10 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton

176. ## Chem simple question

how many mL of .135M Sr(OH)2 are needed to neutralize 35ml of .157M HCL I know the answer came out to 20.4 ml My only question is how do I convert HCL to Sr(OH)2

177. ## History

Which of the following statements about John D. Rockefeller is most accurate? A. He founded the Standard Oil Company when he was 24 years old. B. He considered competition to be the central ideal of capitalism. C. He drilled the first oil well near

178. ## HELP PLZ

what is a project proposal?

179. ## math

light from the sun takes approximately 8 minutes to reach earth. If the light travels at a speed of 3 x 10 raised to 8 meters / second, calculate to 3 significant figures the distance from the sun to the earth

180. ## geometry

if line MS is a median of triangle MNQ. Line QS equals 3a-14, line SN equals 2a + 1, and the measurment of angle MSQ equals 7a+1, find the value of a. Is line MS also an altitude of triangle MNQ?

In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock

182. ## Mathmatics

A function of two variables is given by, f(x,y) = e^2x-3y Find the tangent approximation to f(0.989,1.166) near (0,0), giving your answer to 4 decimal places. Any kind soul to help on the problem. My professor raise this problem to me. i am so stuck.

183. ## Mergers & Acquisitions

List the three ways that tender offer legislation protects target company shareholders?

184. ## Chemistry

Determine if precipitation occurs and write the proper ionic equation a) Na2O3+NiCL2 b) Pb(NO3)2+ALCL3

185. ## Wayne community college

When a 0.101 kg mass is suspended at rest from a certain spring, the spring stretches 3.80 cm. Find the instantaneous acceleration of the mass when it is raised 5.90 cm, compressing the spring 2.10 cm.

186. ## Math Probabilities

P(A or B) = P(A) + P(B) − P(A and B) when 1. A and B are mutually exclusive 2. A and B are complements 3. A and B occur together 4. A and B are dependent I am pretty confused on this one help will be great :)

187. ## Basic Biomechanics

Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at$30 per share, New shoes at $12 per share, and Capital beans and Sprouts at$2.50 per share. He places 60 percent of the money in P.S., 30 percent in N, and 10 percent in B & S.

188. ## Basic Biomechanics

John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?

189. ## Basic Biomechanics

A sailboat heads north at 3 m/s for 1 hour and then tacks back to the southwest (at 45 degree to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?

190. ## Biology

Glucose + Fructose=__________________. I am thinking it is sucrose or table sugar but I am not sure.

191. ## math

A store has 2 times as many hooded sweatshirt as crewneck sweatshirt. The total number of sweatshirts is 36. How many hooded sweatshirts does the store have?

192. ## Chemistry

How many atoms of hydrogen are in a mixture of 3.49x10^23 molecules of H2O and 78.1g of CH3OH?

193. ## Algebra HELP!!

Find the measure of each angle. Angle A is half as large as its complement angle B

194. ## Algebra 1

Solve the equation. 4x + 2 = 5(x + 10)

195. ## world history

what was the most significant reform that Peter the Great implemented in Russia?

207. ## Physics

A student throws a baseball at a large gong 45 m away and hears the sound of the gong 1.35258 s later. The speed of sound in air is 330 m/s.What was the average speed of the base- ball on its way to the gong? (For simplicity, assume its trajectory to be a

208. ## Statistics

1. In a certain game, the probability of getting a red outcome is 0.03. Find the probability of getting an outcome that is not red? The answer must be in a decimal. I put 0.97 as the answer ( 1-0.03=0.97) 2. The instructor in a Humanities class says that

209. ## Pre Algebra

208/1000=x/125 How do you solve it or can you

210. ## math

factor completely n^4-y^4 (n^2+Y^2)(n^2-y^2) (n^2+y^2)(n+y)(n-y) Did I do this correctly? Thank you

211. ## Math/physics

An 6 x 8 wood column is 17 feet tall and is loaded with 40 Kips. Will it buckle (K = 1.0)? How do I set this up and solve? Please show steps. I am confused and do not know how to start. Thank you.

213. ## math

1,0,1,1,01,1,1,0,1,1,1,101, meaning the next numbers are 1,01, right?